Build GraalVM native image

.github/workflows/graalvm.yml

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+name: GraalVM
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: '0 1 * * *'
+
+env:
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+jobs:
+  graalvm:
+    name: GraalVM
+    runs-on: ubuntu-latest
+    outputs:
+      xoom_version: ${{ steps.version.outputs.xoom_version }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up GraalVM
+        uses: DeLaGuardo/[email protected]
+        with:
+          java: 'java8'
+
+      - name: Cache Maven packages
+        uses: actions/cache@v2
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+          restore-keys: ${{ runner.os }}-m2-
+
+      - name: Determine version
+        id: version
+        run: echo "::set-output name=xoom_version::$(mvn help:evaluate -Dexpression=project.version -q -DforceStdout)"
+
+      - name: Install the native-image component
+        run: gu install native-image
+
+      - name: Build with GraalVM
+        run: mvn --batch-mode -Pgithub-releases -Pnative-image clean install
+
+      - name: Publish GraalVM artifacts
+        uses: actions/upload-artifact@v2
+        with:
+          name: GraalVM
+          path: |
+            target/*.h
+            target/*.so
+            target/*.build_artifacts.txt
+
+      - name: Notify slack
+        if: failure() && (github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/tags/')) && github.repository_owner == 'vlingo'
+        uses: rtCamp/action-slack-notify@v2
+        env:
+          SLACK_COLOR: "${{ job.status == 'success' && 'good' || 'danger' }}"
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
+          SLACK_CHANNEL: ci-cd
+          SLACK_USERNAME: Bob the Builder
+          SLACK_ICON: 'https://vlingo.io/wp-content/uploads/cropped-vlingo-favicon-180x180.png'
+          SLACK_FOOTER: 'GraalVM ${{ github.repository }}:${{ steps.version.outputs.xoom_version }}'